CN109895418B - Processing method of special-shaped hollow structure composite material part forming core mold - Google Patents
Processing method of special-shaped hollow structure composite material part forming core mold Download PDFInfo
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- CN109895418B CN109895418B CN201910239803.5A CN201910239803A CN109895418B CN 109895418 B CN109895418 B CN 109895418B CN 201910239803 A CN201910239803 A CN 201910239803A CN 109895418 B CN109895418 B CN 109895418B
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Abstract
The invention relates to the technical field of resin-based fiber reinforced composite prepreg autoclave molding, in particular to a processing method of a molding core mold of a composite part with a special-shaped hollow structure, which adopts a core mold molding mold, wherein the core mold molding mold is provided with a molding space, the molding space is used for molding the molding core mold, and the wall surface of the molding space is a molding surface, and comprises the following steps: laying the soft mold blank onto a forming surface; pressurizing the soft mold blank and the core mold forming mold to make the soft mold blank and the core mold forming mold contact closely; solidifying the soft mold blank to form a soft mold; pouring a water-soluble material into the soft mold until the inner cavity of the soft mold is completely filled; solidifying the water-soluble material; and (6) demolding. The forming core mold obtained by the processing method provided by the invention has the advantages of simple processing, convenient demolding and lower cost.
Description
Technical Field
The invention relates to the technical field of resin-based fiber reinforced composite prepreg autoclave molding, in particular to a processing method of a molding core mold of a composite part with a special-shaped hollow structure.
Background
The composite material has the characteristics of light weight, high specific strength and specific rigidity, strong designability and the like, so that the composite material is increasingly widely applied to the field of aerospace aircraft structural parts; however, the manufacturing of the composite material part with the special-shaped hollow revolving body structure is always difficult, such as an air inlet channel of an aeroengine with an S-shaped deformation section; when the structural part is formed, one surface with high surface quality and high precision requirements is usually selected as a surface which is jointed with a mold, and the surface is called a mold jointing surface for short. When the inner surface of the part is a die surface, a male die laying and forming method can be selected, and the demoulding of the part after curing is difficult; when the outer surface of the part is a die attaching surface, a combined female die can be selected for facilitating subsequent demoulding, but if the section of the part is small and a composite material prepreg laying space is not available, the part cannot be directly laid and formed on the female die, the part needs to be taken off from the male die after being laid on the male die and transferred to the female die for curing, and at the moment, the demoulding of an uncured part blank from the male die is difficult. In order to achieve the purpose of smoothly forming parts, a forming core mold convenient for demolding is required to be designed; the currently commonly used form core mode is as follows:
1) the metal combined type forming core mold has the advantages of multiple assembling relations, high matching surface precision, large processing difficulty, high cost, incapability of ensuring the integral air tightness of the mold, easiness in occurrence of problems of vacuum leakage and the like in the curing process; when the shape is more complex, the processing of the metal combined type die cannot be realized;
2) water-soluble forming core mold: the water-soluble forming core mold is divided into two types, one type is a pouring type forming core mold, namely, a special water-soluble material is poured in a cavity and solidified to obtain the forming core mold, the requirements on the internal quality and the external quality of the forming core mold are high, no hole can be formed, the material is expensive, and the manufacturing cost of the forming core mold is high; another forming core mold is formed by pouring a cube or a cylinder in a cavity and then obtaining a forming core mold surface in a numerical control processing mode, the forming core mold has high requirements on the internal quality and the external quality, cannot have holes, and requires cuttable materials, the same materials are expensive, and the forming core mold has high manufacturing cost;
the water-soluble forming core mold can be removed by water dissolution only after the part is completely solidified, can be used for male mold forming only, and is not suitable for forming composite material parts of variable cross-section special-shaped hollow revolving body structures with high requirements on the surface quality and precision of the outer surface.
Disclosure of Invention
The invention aims to: aiming at the problems of high mold manufacturing cost and difficult demolding in the processing process of the special-shaped hollow structure composite material part in the prior art, the processing method of the special-shaped hollow structure composite material part molding core mold is provided, and the processing method can be used for processing the molding core mold of the composite material part convenient for demolding.
In order to achieve the purpose, the invention adopts the technical scheme that:
a processing method of a core mold for molding a composite material part with a special-shaped hollow structure adopts a core mold molding mold, the core mold molding mold is provided with a molding space, the molding space is used for molding the core mold, and the wall surface of the molding space is a molding surface, and comprises the following steps: laying a soft mold blank onto the forming surface; pressurizing the soft mold blank and the core mold forming mold to make the soft mold blank and the core mold forming mold contact closely; solidifying the soft mold blank to form a soft mold; pouring a water-soluble material into the soft mold until the inner cavity of the soft mold is completely filled; curing the water-soluble material; and (6) demolding.
The processing method can process a forming core mould with a soft mould on the outer surface and a water-soluble material filled in the inner cavity, when the forming core mould is used for processing the special-shaped hollow structure composite material part, the carbon fiber composite material layer is laid on the surface of the forming core mould, after the composite material layer is solidified, the water-soluble forming core mould is removed by flushing water, and then the soft mould is deformed, thus realizing demoulding. The forming core mold obtained by the processing method has the advantages of simple processing, convenient demolding and lower cost.
As a preferable aspect of the present invention, the core mold forming mold includes a first mold body and a second mold body, the first mold body and the second mold body are detachably connected, and the first mold body and the second mold body form the forming space in a connected state; after the demolding step is completed, the processing method further includes the steps of: trimming the flash formed by the soft die at the die assembly position of the first die body and the second die body. The core mold forming mold provided by the invention is of the structure, and the formed core mold can be conveniently separated from the core mold forming mold in the process of processing the formed core mold.
As a preferable scheme of the present invention, the soft mold blank comprises an outer rubber layer, a carbon fiber prepreg layer and an inner rubber layer; when the soft die blank is laid on the forming surface, firstly laying an outer rubber layer, then laying a carbon fiber prepreg layer, and finally laying an inner rubber layer; and the steps are respectively carried out on the first die body and the second die body, and after the soft die blank is completely laid, the first die body and the second die body are closed. Through the structure, the carbon fiber prepreg layer plays a shaping role, and the deformation of the outline of the soft mold can be controlled within a proper range under the action of external force. The rubber layer is arranged on the outer side of the carbon fiber prepreg layer and used for protecting the carbon fiber prepreg layer and avoiding the carbon fiber prepreg layer from being completely broken.
In a preferred embodiment of the invention, the carbon fiber prepreg layer is not more than two layers of prepregs in the laying thickness, and the thickness of each layer of prepregs is not more than 0.25 mm. The thickness of the carbon fiber prepreg layer is set in such a way, so that a certain shaping effect can be provided for the soft mold, and the shape of the soft mold can be changed, so that the soft mold can be taken out through deformation of the soft mold in the demolding process of the composite material part.
In a preferred embodiment of the present invention, when the soft mold blank is cured to form the soft mold, the soft mold blank and the core mold forming mold are integrally transferred to an autoclave, and vacuum and pressure are applied to raise the temperature to a temperature required for vulcanization of the rubber and curing of the carbon fiber prepreg.
In a preferred embodiment of the present invention, the soft mold material is overlapped at the mold clamping position during mold clamping. The soft die blank at the die assembly position of the first die body and the second die body is lapped, and the quality of the soft die at the die assembly position can be ensured.
As a preferable aspect of the present invention, when the soft mold material and the core mold forming die are pressurized: sequentially sleeving a porous isolating film, a breathable felt and a vacuum bag on the outer sides of the soft mold blank, the first mold body and the second mold body after mold assembly, sealing the vacuum bag through a sealing rubber strip to form a vacuum system, and vacuumizing the vacuum system; and after the pressurization is finished, removing the porous isolating membrane, the breathable felt, the vacuum bag and the sealing rubber strip. Through the operation, the soft die blank can be fully attached to the core die forming die, so that the surface quality of the soft die blank after forming is ensured, and the composite material part has higher inner surface quality.
As a preferred scheme of the invention, in the process of curing the soft mold blank to form the soft mold, a non-porous isolating membrane, an air-permeable felt and a vacuum bag are sequentially sleeved outside the soft mold blank, the first mold body and the second mold body after mold closing, the vacuum bag is sealed by a sealing rubber strip, and the vacuum is pumped until the vacuum degree is not less than-0.9 bar.
As a preferable scheme of the present invention, both ends of the molding space have openings, the core mold molding die further includes a sealing plate, the sealing plate is used for connecting with edges of the openings, and the sealing plate is provided with through holes; the forming core mold comprises a supporting rod, and the supporting rod is matched with the opening; before pouring water-soluble materials into the soft mold, one of the seal plates is installed, a support rod is inserted into a through hole of the seal plate, one end of the support rod is positioned in the water-soluble forming core mold, the other end of the support rod is positioned outside the forming space, and a gap between the seal plate and the first mold body, a gap between the seal plate and the second mold body and a gap between the seal plate and the support rod are sealed; pouring water-soluble materials into the soft mold until the inner cavity of the soft mold is completely filled, installing another sealing plate, inserting a supporting rod into the through hole of the sealing plate, wherein one end of the supporting rod is positioned in the water-soluble core, the other end of the supporting rod is positioned outside the forming space, and sealing a gap between the sealing plate and the first mold body, a gap between the sealing plate and the second mold body, and a gap between the sealing plate and the supporting rod. Meanwhile, the supporting rods are arranged on the forming core mold, so that the forming core mold can be fixed through the supporting rods in the subsequent processing process of the composite material part, the surface of the forming core mold cannot be influenced, and the paving operation is facilitated.
In a preferred embodiment of the present invention, when the water-soluble material is cured, the core mold forming die, the soft mold material, and the water-soluble material are placed in an oven as a whole, and the temperature is raised to cure the water-soluble material.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the processing method can process a forming core mould with a soft mould on the outer surface and a water-soluble material filled in the inner cavity, when the forming core mould is used for processing the special-shaped hollow structure composite material part, the carbon fiber composite material layer is laid on the surface of the forming core mould, after the composite material layer is solidified, the water-soluble forming core mould is removed by flushing water, and then the soft mould is deformed, thus realizing demoulding. The forming core mold obtained by the processing method has the advantages of simple processing, convenient demolding and lower cost.
Drawings
Fig. 1 is a schematic structural diagram of a composite material part with a variable cross-section special-shaped hollow structure provided by an embodiment of the invention.
Fig. 2 is a schematic structural view of a core mold forming die according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of the core mold forming die according to the embodiment of the present invention with the closing plate removed.
Fig. 4 is a schematic structural diagram of the processing method according to the embodiment of the present invention when step S3 is performed.
Fig. 5 is a partially enlarged view of a portion I in fig. 4.
Fig. 6 is a schematic structural diagram of the processing method according to the embodiment of the present invention when step S4 is performed.
Fig. 7 is a schematic structural diagram of the processing method according to the embodiment of the present invention after step S6 is completed.
Fig. 8 is a schematic structural view of a forming core mold obtained by the processing method provided in the embodiment of the present invention.
Figure 9 is a cross-sectional view of a forming plug obtained by a method of machining provided by an embodiment of the present invention.
FIG. 10 is a schematic view of a pre-compaction operation in step A3 in working example (one).
Fig. 11 is a partial enlarged view of section ii in fig. 10.
Fig. 12 is a schematic view of the processing example (a), when step a4 is performed.
Fig. 13 is a partially enlarged view of the portion iii in fig. 12.
Fig. 14 is a schematic view of a female mold for molding used in working example (ii).
Fig. 15 is a schematic view of the structure of step B3 in example (ii) of the processing.
Fig. 16 is a schematic structural view of the processing example (ii) when step B6 is performed.
Icon: 1-a composite part; 2-core mould forming mould; 21-a first mold body; 22-a second mold body; 23-closing the plate; 4-a perforated barrier film; 5-air felt; 6-vacuum bag; 7-a non-porous barrier film; 8-sealing adhesive tape; 3-forming a core mold; 31-soft mode; 32-a water-soluble core; 33-support rods; 9-forming a female die; 91-a first female mold body; 92-second female mold body.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Please refer to fig. 1-9. The embodiment of the invention provides a method for processing a core mold 3 for molding a composite material part 1 with a variable-section special-shaped hollow revolving body structure. Referring to fig. 8 and 9, this process results in a forming core 3. Such a forming core mold 3 can be used for processing the composite material part 1 of the variable cross-section special-shaped hollow solid of revolution structure shown in fig. 1.
Referring to fig. 2 and 3, the method of processing according to the embodiment of the present invention uses a core mold 2, and the core mold 2 includes a first mold body 21, a second mold body 22, and a closing plate 23. The first mold body 21 and the second mold body 22 are removably connected. When the first die body 21 and the second die body 22 are connected, a molding space can be formed, and the shape of the molding space is used for being matched with the outer surface of the composite part 1. Both ends of the molding space are provided with openings which are used for being communicated with the outside. The surface of the molding space is a molding surface.
In the embodiment, the first mold body 21 and the second mold body 22 are detachably connected by screws.
The number of closure plates 23 is two, one of which 23 is adapted to be connected to an opening at one end of the forming space and the other of which 23 is adapted to be connected to an opening at the other end of the forming space. The closing plate 23 is provided with a through hole.
The processing method provided by the embodiment of the invention comprises the following steps:
s1, laying a soft die 31 blank on the forming surface;
wherein the soft mold 31 blank comprises an outer rubber layer, a carbon fiber prepreg layer and an inner rubber layer. In the process of laying, an outer rubber layer, a carbon fiber prepreg layer and an inner rubber layer are sequentially laid on the molding surface of the first mold body 21, and an outer rubber layer, a carbon fiber prepreg layer and an inner rubber layer are sequentially laid on the molding surface of the second mold body 22.
Further, in this embodiment, the curing temperature of the carbon fiber prepreg layer is close to the vulcanization temperature of the outer rubber layer and the inner rubber layer, so that in the later curing process, the carbon fiber prepreg layer can be fully cured, and the rubber layer can be fully vulcanized.
Further, in this embodiment, the carbon fiber prepreg layer is a carbon fiber fabric prepreg layer. The outer rubber layer and the inner rubber layer are made of rubber materials with temperature resistance of more than or equal to 250 ℃, and the vulcanization temperature range is 176 +/-5 ℃.
The number of the carbon fiber prepreg layers is two, and the thickness of the single-layer carbon fiber prepreg layer is not more than 0.25 mm. The layering directions of the two carbon fiber fabric prepreg layers are kept consistent, so that the symmetry of layering is ensured, and the carbon fiber prepreg layers are prevented from deforming after being cured.
S2, carrying out die assembly operation on the first die body 21 and the second die body 22;
wherein, at the mold closing position, the soft mold 31 blank on the first mold body 21 is overlapped with the soft mold 31 blank on the second mold body 22, so as to increase the strength of the soft mold 31 at the mold closing position.
Please refer to fig. 4 and 5:
s3, pressurizing the soft mold 31 blank and the core mold forming mold 2 to enable the soft mold 31 blank to be in close contact with the core mold forming mold 2;
the outer sides of the soft mold 31 blank and the first mold body 21 and the second mold body 22 after mold closing are sequentially sleeved with the porous isolating film 4, the air-permeable felt 5 and the vacuum bag 6, the vacuum bag 6 is sealed through the sealing rubber strip 8 to form a vacuum system, and the vacuum system is vacuumized to generate pressure so that the soft mold 31 blank is in close contact with the first mold body 21 and the second mold body 22.
After the pressurization is completed, the apertured separator 4, airfelt 5 and vacuum bag 6 are removed.
Please refer to fig. 6 and 7:
s4, solidifying the blank of the soft mold 31 to form the soft mold 31;
the outer sides of the soft mold 31 blank, the first mold body 21 and the second mold body 22 after mold closing are sequentially sleeved with a non-porous isolating membrane 7, an air-permeable felt 5 and a vacuum bag 6, the vacuum bag 6 is sealed through a sealing rubber strip 8, vacuumizing is performed until the vacuum degree is not less than-0.9 bar, the soft mold 31 blank and the core mold forming mold 2 are integrally conveyed into an autoclave, vacuum and pressure are applied, and the temperature is raised to the temperature required by rubber vulcanization and carbon fiber prepreg layer curing;
after curing is complete, the non-porous barrier film 7, airfelt 5 and vacuum bag 6 are removed.
S5, installing one of the seal plates 23, inserting a support rod 33 into a through hole of the seal plate 23, wherein one end of the support rod 33 is positioned in the forming space, and the other end of the support rod 33 is positioned outside the forming space, and sealing a gap between the seal plate 23 and the first die body 21, a gap between the seal plate 23 and the second die body 22, and a gap between the seal plate 23 and the support rod 33;
wherein, each gap is sealed by a sealing rubber strip 8.
And S6, pouring a water-soluble material into the soft mold 31 until the inner cavity of the soft mold 31 is completely filled.
The water-soluble material in this embodiment is a material that can be removed by the flushing action of the water flow. In this embodiment, it is preferable to use a high-temperature resistant water-soluble material such as: the mixed solution of polyvinyl alcohol (PVAL) aqueous solution and polyvinylpyrrolidone (PVP) aqueous solution is used as a base material, and quartz sand or glass beads are used as water-soluble materials of a reinforcing material. Wherein the mixed solution of polyvinyl alcohol (PVAL) aqueous solution and polyvinylpyrrolidone (PVP) aqueous solution is used as adhesive, and the adhesive is water-soluble. After the adhesive is dissolved in water, the quartz sand or the glass beads are collapsed, so that the water-soluble core is removed.
And S7, installing another sealing plate 23, inserting a support rod 33 into the through hole of the sealing plate 23, wherein one end of the support rod 33 is positioned in the water-soluble material, and the other end of the support rod 33 is positioned outside the forming space, and sealing the gap between the sealing plate 23 and the first die body 21, the gap between the sealing plate 23 and the second die body 22, and the gap between the sealing plate 23 and the support rod 33.
S8, solidifying the water-soluble material;
wherein, the core mould forming mould 2, the soft mould 31 blank and the water-soluble material are integrally placed in an oven, and the temperature is raised to solidify the water-soluble material.
And S9, demolding.
The closure plate 23 is removed and the first casing 21 is separated from the second casing 22.
S10, trimming the flash of the soft mold 31 at the mold closing position.
The forming core mold 3 obtained by the above-described processing method provided by the embodiment of the present invention includes a soft mold 31, a water-soluble core portion 32, and a support rod 33.
The soft mold 31 includes a vulcanized outer rubber layer and an inner rubber layer, and a carbon fiber composite material layer is disposed between the outer rubber layer and the inner rubber layer. The space surrounded by the soft mold 31 is filled with a water-soluble core 32 made of a water-soluble material.
The number of the support rods 33 is two, wherein one support rod 33 is located at one end of the water-soluble core 32, and the other support rod 33 is located at the other end of the water-soluble core 32. The support rod 33 has one end inserted into the water-soluble core 32 and the other end located outside the water-soluble core 32.
The forming core mold 3 obtained by the processing method can be used for processing the variable cross-section special-shaped hollow revolving body structure composite material part 1 with high requirements on the surface quality and precision of the inner molded surface, and can also be used for processing the variable cross-section special-shaped hollow revolving body structure composite material part 1 with high requirements on the surface quality and precision of the outer molded surface.
The following is illustrated by two processing examples:
example (a):
referring to fig. 10-13, when the forming core mold 3 is used for processing the composite material part 1 with the variable cross-section special-shaped hollow revolving body structure and high requirements on the surface quality and precision of the inner surface:
A1. the forming core mold 3 is fixed by a support rod 33;
wherein, the support rod 33 is clamped, so that the fixing of the forming core mold 3 can be realized, thereby the surface of the whole soft mold 31 is not shielded, and the paving and pasting of the composite material layer are convenient.
A2. Spreading release cloth with glue on the surface of the soft mold 31;
if a plurality of pieces of release cloth are needed to cover the surface of the soft mold 31, two adjacent pieces of release cloth are butted without being spliced. Namely: the sidelines of two adjacent demolding cloths are in contact, but the two demolding cloths do not overlap in the thickness direction. By this arrangement, the influence of the overlapping of the release cloths on the surface quality of the composite part 1 is avoided.
A3. Paving and pasting a composite material prepreg on the surface of the soft mold 31;
wherein, in the process of paving and pasting, pre-compaction is carried out every other preset composite material thickness. The pre-compaction operation is specifically performed as follows: and sequentially laying a porous isolating membrane 4, an air-permeable felt 5 and a vacuum bag 6 on the outer side of the composite material layer, sealing the vacuum bag 6, enabling the forming mould and the composite material to be positioned in the vacuum bag 6 to form a vacuum system, vacuumizing the vacuum system, and compacting the composite material under the action of atmospheric pressure.
Further, after the first laying is finished, and then, performing pre-compaction operation every three laying layers.
A4. Curing the composite prepreg;
wherein the curing of the composite prepreg is carried out in such a way: and laying a non-porous isolating membrane 7, an air-permeable felt 5 and a vacuum bag 6 outside the composite material layer in sequence, sealing the vacuum bag 6, enabling the forming mould and the composite material to be positioned in the vacuum bag 6 to form a vacuum system, integrally placing the vacuum system into an autoclave, applying pressure and vacuum, and raising the temperature.
A5. Removing the water-soluble core 32 and separating the soft mold 31 from the cured composite material;
wherein, the water flow through the high pressure squirt washes this water-soluble core 32, after removing the water-soluble core 32, make the soft mould 31 produce the deformation, separate the soft mould 31 and solidified composite material.
A6. And trimming the cured composite material to obtain the required composite material part 1.
Working example 2
Referring to fig. 14-16, when the forming core mold 3 is used for processing the composite material part 1 with the variable cross-section special-shaped hollow revolving body structure and high requirements on the surface quality and precision of the outer mold surface:
B1. the forming core mold 3 is fixed by a support rod 33;
wherein, the support rod 33 is clamped, so that the fixing of the forming core mold 3 can be realized, thereby the surface of the whole soft mold 31 is not shielded, and the paving and pasting of the composite material layer are convenient.
B2. Spreading release cloth with glue on the surface of the soft mold 31;
if a plurality of pieces of release cloth are needed to cover the surface of the soft mold 31, two adjacent pieces of release cloth are butted without being spliced. Namely: the sidelines of two adjacent demolding cloths are in contact, but the two demolding cloths do not overlap in the thickness direction. By this arrangement, the influence of the overlapping of the release cloths on the surface quality of the composite part 1 is avoided.
B3. Paving and pasting a composite material prepreg on the surface of the soft mold 31;
wherein, in the process of paving and pasting, pre-compaction is carried out every other preset composite material thickness. The pre-compaction operation is specifically performed as follows: and sequentially laying a porous isolating membrane 4, an air-permeable felt 5 and a vacuum bag 6 on the outer side of the composite material layer, sealing the vacuum bag 6, enabling the forming mould and the composite material to be positioned in the vacuum bag 6 to form a vacuum system, vacuumizing the vacuum system, and compacting the composite material under the action of atmospheric pressure.
Further, after the first laying is finished, and then, performing pre-compaction operation every three laying layers.
After the pre-compaction operation is completed, the apertured barrier film 4, airfelt 5 and vacuum bag 6 are removed.
B4. And arranging a sealing rubber strip 8 on the surface of the soft mold 31 in the area which is not covered with the composite material prepreg, covering the vacuum bag 6 on the soft mold 31, and enabling the sealing rubber strip 8, the vacuum bag 6 and the soft mold 31 to form a sealing system in which the composite material prepreg is positioned.
B5. The water soluble core 32 is removed.
Wherein the water soluble core 32 may be removed by flushing with a high pressure water gun. After removing the water-soluble core 32, the inner surface of the soft mold 31 is wiped.
B6. Placing the soft mold 31 and the composite material prepreg into a forming female mold 9, and curing the composite material prepreg;
when the composite material prepreg is cured, the non-porous isolation film 7, the air-permeable felt 5 and the vacuum bag 6 are sequentially paved outside the composite material layer, the vacuum bag 6 is sealed, the forming core mold 3, the forming female mold 9 and the composite material are positioned in the vacuum bag 6 to form a vacuum system, the vacuum system is integrally placed into an autoclave, pressure and vacuum are applied, and the temperature is raised.
B7. Disassembling the first female mold body 91 and the second female mold body 92, and removing the soft mold 31;
B8. and (3) polishing the composite part 1, and trimming the appearance of the composite part 1 corresponding to the glued edges at the die closing positions of the first female die body 91 and the second female die body 92.
The processing method of the composite material part 1 with the variable cross-section special-shaped hollow revolving body structure provided by the invention has the following beneficial effects:
1. by the processing method, the forming core mould 3 with the soft mould 31 on the outer surface and the water-soluble material filled in the inner cavity can be processed, when the special-shaped hollow composite material part 1 is processed by the forming core mould 3, the carbon fiber composite material layer is laid on the surface of the forming core mould 3, after the composite material layer is solidified, the water-soluble forming core mould 3 is removed by flushing water, and then the soft mould 31 is deformed, thus realizing demoulding. The forming core mold 3 obtained by the processing method has the advantages of simple processing, convenient demolding and lower cost.
2. In the processing method provided by the embodiment of the invention, the soft mold 31 comprises the carbon fiber composite material layer, so that a certain shaping capacity can be provided for the soft mold 31, the soft mold 31 is prevented from generating too large deformation, and meanwhile, the shape of the soft mold 31 can be changed by controlling the thickness of the laid carbon fiber composite material layer, so that the demolding is facilitated;
3. in the processing method provided by the invention, the carbon fiber composite material layer is arranged between the inner rubber layer and the outer rubber layer, and can be protected through the inner rubber layer and the outer rubber layer, so that even if the carbon fiber composite material layer is locally damaged, the soft mold 31 cannot be completely broken due to the local damage.
It should be noted that the drawings of the present invention only show one possible configuration of the composite material part 1. The machining method provided by the invention can also be used for machining forming core moulds 3 with other different structures, and is not limited to the situation shown in the drawing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A processing method of a core mold for molding a special-shaped hollow-structure composite material part is characterized in that a core mold molding mold is adopted, a molding space is arranged on the core mold molding mold, the molding space is used for molding a core mold, and the wall surface of the molding space is a molding surface, and comprises the following steps:
laying a soft mold blank onto the forming surface;
pressurizing the soft mold blank and the core mold forming mold to make the soft mold blank and the core mold forming mold contact closely;
solidifying the soft mold blank to form a soft mold; pouring a water-soluble material into the soft mold until the inner cavity of the soft mold is completely filled; curing the water-soluble material;
demolding;
the core mold forming mold comprises a first mold body and a second mold body, the first mold body and the second mold body are detachably connected, and the first mold body and the second mold body form the forming space in a connected state;
after the demolding step is completed, the processing method further includes the steps of: trimming flash formed by the soft die at the die assembly position of the first die body and the second die body;
the soft mold blank comprises an outer rubber layer, a carbon fiber prepreg layer and an inner rubber layer;
when the soft die blank is laid on the forming surface, firstly laying an outer rubber layer, then laying a carbon fiber prepreg layer, and finally laying an inner rubber layer;
and the steps are respectively carried out on the first die body and the second die body, and after the soft die blank is completely laid, the first die body and the second die body are closed.
2. The process of claim 1, wherein the carbon fiber prepreg layer is laid up no more than two layers of prepreg, each layer having a thickness of no more than 0.25 mm.
3. The process according to claim 1, wherein the soft mold blank is cured to form a soft mold, and the soft mold blank and the core mold forming mold are integrally transferred to an autoclave, and vacuum and pressure are applied to raise the temperature to a temperature required for vulcanization of the rubber and curing of the carbon fiber prepreg.
4. The process of claim 1 wherein the overlapping of the soft mold blanks at the closure is effected during closure.
5. The processing method according to claim 4, wherein in the step of integrally vacuumizing and pre-pressing the soft mold blank and the core mold forming mold:
sequentially sleeving a porous isolating film, a breathable felt and a vacuum bag on the outer sides of the soft mold blank, the first mold body and the second mold body after mold assembly, sealing the vacuum bag through a sealing rubber strip to form a vacuum system, and vacuumizing the vacuum system;
and after vacuumizing and pre-compacting are finished, removing the porous isolating membrane, the breathable felt, the vacuum bag and the sealing rubber strip.
6. The processing method according to claim 5, wherein in the step of curing the soft mold blank to form the soft mold, a non-porous isolating membrane, an air-permeable felt and a vacuum bag are sequentially sleeved on the outer sides of the soft mold blank, the first mold body and the second mold body after mold closing, the vacuum bag is sealed through a sealing rubber strip, and vacuum is pumped until the vacuum degree is not less than-0.9 bar.
7. The processing method as claimed in claim 1, wherein the forming space has openings at both ends thereof, the core mold forming die further comprises a closing plate for connecting edges of the openings, the closing plate having through holes;
the forming core mold comprises a supporting rod, and the supporting rod is matched with the opening;
before pouring water-soluble materials into the soft mold, one of the seal plates is installed, a support rod is inserted into a through hole of the seal plate, one end of the support rod is positioned in the molding space, the other end of the support rod is positioned outside the molding space, and a gap between the seal plate and the first mold body, a gap between the seal plate and the second mold body and a gap between the seal plate and the support rod are sealed;
pouring a water-soluble material into the soft mold, installing another sealing plate until the inner cavity of the soft mold is completely filled, inserting a supporting rod into the through hole of the sealing plate, wherein one end of the supporting rod is positioned in the water-soluble material, the other end of the supporting rod is positioned outside the forming space, and sealing a gap between the sealing plate and the first mold body, a gap between the sealing plate and the second mold body, and a gap between the sealing plate and the supporting rod.
8. The process according to claim 7, wherein the water-soluble material is cured by heating the entire of the core mold forming die, the soft mold blank and the water-soluble material in an oven to dry and cure the water-soluble material.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492129A1 (en) * | 1990-11-26 | 1992-07-01 | Excell Corporation | A multi-layer plastic pipe and its method for manufacturing |
| CN101585236A (en) * | 2008-05-23 | 2009-11-25 | 珠海市恒基业安全头盔有限公司 | Molding technology of composite material special product |
| CN106166811A (en) * | 2016-07-01 | 2016-11-30 | 宜兴市凯诚模具有限公司 | A kind of production technology of silica gel mould |
| CN106313378A (en) * | 2016-10-11 | 2017-01-11 | 中国航空工业集团公司基础技术研究院 | Method for preparing and using fiber-reinforced hat-shaped rib molding soft mold |
| JP2019025848A (en) * | 2017-08-02 | 2019-02-21 | 藤倉ゴム工業株式会社 | Method for manufacturing hollow elastic molding |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101890807B (en) * | 2010-07-19 | 2012-10-10 | 哈尔滨飞机工业集团有限责任公司 | Method for pressurizing and molding composite part by using thermal expansion of silicone rubber |
| TW201414600A (en) * | 2012-10-15 | 2014-04-16 | Jin-Biao Huang | Forming method of composite material |
| CN104441696A (en) * | 2014-09-22 | 2015-03-25 | 成都飞机工业（集团）有限责任公司 | Manufacture method of special-shaped composite material rib |
| CN108115948B (en) * | 2017-12-26 | 2020-09-25 | 天津工业大学 | Composite material forming core mold and preparation method |
| CN108943769B (en) * | 2018-06-21 | 2020-05-12 | 西安爱生技术集团公司 | Manufacturing method of non-equal-diameter closed square tubular carbon fiber beam structural part of unmanned aerial vehicle |
-
2019
- 2019-03-27 CN CN201910239803.5A patent/CN109895418B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492129A1 (en) * | 1990-11-26 | 1992-07-01 | Excell Corporation | A multi-layer plastic pipe and its method for manufacturing |
| CN101585236A (en) * | 2008-05-23 | 2009-11-25 | 珠海市恒基业安全头盔有限公司 | Molding technology of composite material special product |
| CN106166811A (en) * | 2016-07-01 | 2016-11-30 | 宜兴市凯诚模具有限公司 | A kind of production technology of silica gel mould |
| CN106313378A (en) * | 2016-10-11 | 2017-01-11 | 中国航空工业集团公司基础技术研究院 | Method for preparing and using fiber-reinforced hat-shaped rib molding soft mold |
| JP2019025848A (en) * | 2017-08-02 | 2019-02-21 | 藤倉ゴム工業株式会社 | Method for manufacturing hollow elastic molding |
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